US10208910B2 - Motor vehicle headlamp having a two-chamber reflection system - Google Patents

Motor vehicle headlamp having a two-chamber reflection system Download PDF

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US10208910B2
US10208910B2 US14/976,431 US201514976431A US10208910B2 US 10208910 B2 US10208910 B2 US 10208910B2 US 201514976431 A US201514976431 A US 201514976431A US 10208910 B2 US10208910 B2 US 10208910B2
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group
led chips
headlamp
reflector
set forth
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US20160186952A1 (en
Inventor
Henning Hogrefe
Markus Kratzer
Sebastian Schildmann
Michael Scholl
J. Tobias F. Wagner
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Marelli Automotive Lighting Reutlingen Germany GmbH
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Automotive Lighting Reutlingen GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/321—Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • F21S41/148—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device the main emission direction of the LED being perpendicular to the optical axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • F21S41/153—Light emitting diodes [LED] arranged in one or more lines arranged in a matrix
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
    • F21S41/331—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of complete annular areas
    • F21S41/333—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of complete annular areas with discontinuity at the junction between adjacent areas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/36—Combinations of two or more separate reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/663—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
    • F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles

Definitions

  • the invention relates to an LED headlamp, which generates a low-beam light distribution with a reflection system, and which can also be switched to generate a light distribution that is not dimmed.
  • a system of this type is disclosed, for example, in JP 2011129283. Furthermore, a system is disclosed in DE 10 2007 025 337, in which special LED chip combinations are specified. DE 10 2010 045 847 represents a further application in this field.
  • the generation of a light distribution using a reflection system is understood to mean a generation thereof that can be achieved without expensive and heavy projection lenses.
  • the light volume refers to the illumination of the region in front of the headlamp with a specific luminous flux (e.g. 1,000 lumen).
  • the quality is measured according to criteria such as homogeneity of the brightness, the avoidance of a glare, a sharpness of the light/dark borders, a limited brightness gradient in the transition from bright to dark in the lateral edge regions, a good lateral illumination, and so on.
  • a dimmed light distribution is a known low-beam light distribution.
  • a non-dimmed light distribution is a known high-beam light distribution.
  • a double headlamp is distinguished by two light exit surfaces for each headlamp, this being for each side of the vehicle.
  • the light exit surface for the low beam light is disposed further to the outside than the light exit surface for the high-beam light.
  • the low-beam light is generated by only the outer reflectors.
  • Double headlamps are also known in which an outer reflector and an associated inner reflector have at least one different signal image (e.g. differently disposed brighter and darker regions of the respective light exit surface).
  • both reflectors of a headlamp have a basically identical signal image when the low-beam light is activated, seen from a central direction, and also that the entire reflector surface, thus the sum of the reflector surfaces, appears to be illuminated in a uniform manner.
  • the motor vehicle headlamp according to the invention has a first reflection module, having a first reflector, a first group of LED chips and a second group of LED chips, wherein the LED chips of the second group are disposed offset to the LED chips of the first group in the main beam direction of the first reflector.
  • the motor vehicle headlamp furthermore has a second reflection module, having a second reflector, a third group of LED chips and a fourth group of LED chips, wherein the LED chips of the fourth group are disposed offset to the LED chips of the third group in the main beam direction.
  • the headlamp has a control circuit, which is configured for controlling the current flow through the LED chips, and which is configured to activate the LED chips of the first group together with the LED chips of the fourth group in a first switching state, and which control circuit is configured to activate the LED chips of the second group together with the LED chips of the third group in a second switching state, wherein the LED chips of the first group and the LED chips of the fourth group are deactivated in the second switching state.
  • a high-beam light is generated with the activation of the LED chips of the first group together with the LED chips of the fourth group, for example.
  • a low beam light is generated with the activation of the LED chips of the second group together with the LED chips of the third group, for example, wherein the LED chips of the first group and the fourth group that generate the high-beam light are deactivated.
  • a preferred embodiment is distinguished in that the control device is configured to activate and/or leave the LED chips of the second group and/or the LED chips of the third group in an activated state when the LED chips of the first group, together with the LED chips of the fourth group are activated.
  • the control device is configured to activate and/or leave the LED chips of the second group and/or the LED chips of the third group in an activated state when the LED chips of the first group, together with the LED chips of the fourth group are activated.
  • An activation is understood to mean a control of the current flow in which the light emitting diodes appear to be illuminated for a human sense of sight.
  • Light emitting diodes are frequently switched on and off with a duty cycle having a higher frequency, wherein the human sense of sight only registers an average brightness.
  • Such frequencies are typically higher than 100 Hz, wherein up to 200 Hz is typical.
  • control circuit is configured to activate the LED chips of the first group of LED chips, which illuminate the first reflector, together with the LED chips of the fourth group of LED chips, which illuminate the second reflector, light is emitted from the light exit surfaces of both reflection modules, such that both light exit surfaces appear to be brightly illuminated. As a result, a more attractive signal image is generated than with a conventional double headlamp. Because the LED chips of the second group of LED chips, which illuminate the first reflector, and the LED chips of the third group of LED chips, which illuminate the second reflector, are switched off thereby (or deactivated, respectively), a first light distribution is generated, for a high-beam light distribution, for example.
  • a second light distribution is provided, e.g. a low-beam light distribution, wherein an attractive signal image is likewise obtained thereby, in that here as well, the light exit surfaces of both reflection modules contribute to the generation of the light distribution.
  • a second light distribution is provided, e.g. a low-beam light distribution, wherein an attractive signal image is likewise obtained thereby, in that here as well, the light exit surfaces of both reflection modules contribute to the generation of the light distribution.
  • each of the specified partial light distributions can be constructed from two individual partial light distributions, which have individual, different properties due to their generation through different reflection modules, and which provide optimized light distributions when superimposed on one another.
  • the partial light distributions generated by one reflection module are wider, for example, than the partial light distributions generated by the other reflection module. It is thus possible to generate low-beam light distributions and high-beam light distributions with high brightness levels in the center and wider lateral illumination in a simple manner, inexpensively and having attractive signal images.
  • a bi-functional reflection system must fulfill the following requirements.
  • a very sharply focused light/dark border must be generated in the dimmed light distribution, wherein this should only be achieved through the interaction of the reflector with the LED light source.
  • the shape of the reflector must be designed such that the light distribution with a horizontal upper light/dark border can be generated using a portion of the LED chips.
  • not dimmed light distribution e.g. the high-beam light distribution
  • a frequently even more clearly stronger maximum is required, wherein, however, a light/dark border is not required.
  • the same reflector surfaces, but a substantially different portion of the LED chips are to be used thereby for the generation of the dimmed light distribution as well as for the generation of the non-dimmed light distribution.
  • the invention provides an inexpensive semiconductor light source motor vehicle headlamp with a reflection system having a harmonious appearance and a good range.
  • the use of a reflection system that functions without expensive and heavy light-diffractive projection optics contributes to the low prices.
  • One embodiment is distinguished in that the LED chips of the first group are disposed in a row that is transverse to a main beam direction of the first reflector.
  • the second group has fewer LED chips than the first group.
  • the LED chips of the third group are disposed in a row that is transverse to a main beam direction of the second reflector, and wherein the fourth group has fewer LED chips than the third group.
  • the LED chips of the second group may be disposed in the main beam direction of the first reflector in front of the first group, and thus spaced further apart from the light exit surface of the first reflector than the first group of light emitting diodes.
  • the LED chips of the second group may be disposed in a row.
  • the row of LED chips of the second group may be parallel to the row of LED chips of the first group.
  • the fourth group may have fewer LED chips than the third group.
  • the LED chips of the fourth group may be disposed in a V-pattern, the tip of which points in the main beam direction.
  • the number of LED chips in the first group may be the same as the number of LED chips in the third group, and the number of LED chips in the second group may be the same as the number of LED chips in the fourth group.
  • the partial light distributions generated by the first reflection module may be narrower in the horizontal direction than the partial light distributions generated by the second reflection module, when in an intended use.
  • the second reflector through its shape, in conjunction with the arrangement of the third group of LED chips, acts to generate a partial light distribution having an upper light/dark border that runs, at least in part, horizontally, in an intended use of the headlamp.
  • the light exit surfaces of the two reflectors have similar edge shapes and similar sizes.
  • edges of the light exit surfaces may be circular, or have the same number of corners and similar side lengths.
  • the circumference of the smaller light exit surface is not smaller than 80% of the circumference of the larger light exit surface.
  • FIG. 1 shows a top view of a horizontal section of a motor vehicle headlamp
  • FIG. 2 shows an exemplary embodiment of a control circuit
  • FIG. 3 shows partial light distributions generated by the reflection system
  • FIG. 4 shows a cross section of the subject matter of FIG. 1 , as a component of a further exemplary embodiment.
  • FIG. 1 shows a top view of a horizontal section of a motor vehicle headlamp 10 having a housing 12 and a transparent cover plate 14 , which covers a light exit opening of the headlamp.
  • a first reflection module 16 and a second reflection module 18 are disposed inside the housing.
  • the first reflection module has a first reflector 20 , a first group 22 of LED chips 24 , and a second group 26 of LED chips 28 .
  • An LED chip is understood in this application to be a single, coherent light exit surface of a light emitting diode, wherein numerous such light exit surfaces can lie on a common substrate, wherein the light emissions thereof can be controlled collectively.
  • the LED chips 24 of the first group 22 are disposed in a row that is transverse to a main beam direction z of the first reflector 20 .
  • the second group 26 has fewer LED chips than the first group 22 .
  • the LED chips 28 of the second group 26 are disposed offset to the LED chips 24 of the first group 22 in the main beam direction z.
  • the LED chips 28 of the second group are disposed in the main beam direction of the first reflector 20 in front of the first group 22 . They are thus, in particular, disposed further apart from the light exit surface 30 of the first reflector 20 than the first group 22 of light emitting diodes.
  • the first group 22 may have five LED chips here, and the second group 26 may have three LED chips here.
  • the LED chips of the second group are also disposed in a row here. The row of LED chips of the second group is parallel to the row of LED chips of the first group.
  • the second reflection module has a second reflector 32 , a third group 34 of LED chips 36 , and a fourth group 38 of LED chips 40 .
  • the LED chips 36 of the third group 34 are disposed thereby in a row that is transverse to a main beam direction z of the second reflector 32 .
  • the fourth group 38 has fewer LED chips than the third group 34 .
  • the LED chips 40 of the fourth group 38 are disposed offset to the LED chips 36 of the third group 34 in the main beam direction z.
  • the LED chips 36 of the third group 34 are disposed in the main beam direction z of the second reflector 32 in front of the fourth group 38 .
  • the third group 34 has the preferred number of five LED chips 36 here, and the fourth group 38 has the preferred number of three LED chips here.
  • the LED chips 40 of the fourth group 38 are disposed in a V-pattern here, the tip of which points in the main beam direction z.
  • the headlamp has a control circuit 44 , which is configured for controlling the current flow through the light emitting diodes 24 , 28 , 36 , 40 .
  • the control circuit 44 is preferably configured, in particular, to activate the LED chips of the first group of LED chips of the first reflection module together with the LED chips of the fourth group of LED chips of the second reflection module, wherein the LED chips of the second group of LED chips of the first reflection module and the LED chips of the third group of LED chips of the second reflection module are deactivated.
  • the control circuit 44 is furthermore configured to activate the LED chips of the second group 26 of LED chips 28 of the first reflection module 16 together with the LED chips 36 of the third group 34 of LED chips of the second reflection module 18 , wherein the LED chips 24 of the first group 22 of LED chips of the first reflection module 16 and the LED chips 40 of the fourth group 38 of LED chips of the second reflection module 18 are deactivated.
  • the control circuit 44 can be disposed internally or externally on the headlamp 10 . It is configured, in particular, programmed, to control the luminous flux of the individual semiconductor light sources 24 , 28 , 36 , 40 , preferably in groups, comprising, in particular, the activation and deactivation thereof, and the control of the brightness.
  • This control circuit 44 is a component of the invention, independently of its position.
  • the control circuit 44 is preferably controlled in an intended use of the headlamp on its part, by a superordinated control device 46 , which receives a driver signal for a light switch 48 , for example, for this.
  • the superordinated control device 46 sends a signal to the control circuit 44 , regarding whether and, if applicable, which light distribution should be generated, and the control circuit 44 controls the individual semiconductor chips 24 , 28 , 36 , 40 thereupon, such that the desired light distribution is obtained.
  • FIG. 2 shows an exemplary embodiment of the control circuit 44 together with the four groups 22 , 26 , 34 , 38 of LED chips and two switches 48 , 50 , with which the control device 44 controls the light emission of the four groups of LED chips.
  • the first switch 48 serves to activate a current supply for the semiconductor light sources
  • the second switch 50 serves to activate and deactivate either the first group 22 of LED chips together with the fourth group 38 of LED chips, or to activate and deactivate the second group 26 of LED chips together with the third group 34 of LED chips.
  • the first switch 48 can, for example, be activated with a duty cycle for setting an average brightness.
  • the first switch 48 When the first switch 48 is engaged, a current flows from a supply potential (+) to the ground via the first switch 48 , the second switch 50 and two of the four groups of LED chips. In doing so, depending on the switching setting of the second switch 50 , either the first group 22 together with the fourth group 38 emits light, wherein the second group 26 and the third group 34 remain inactive, or the second group 26 and the third group 34 emit light, wherein the first group 26 and the fourth group 38 remain inactive.
  • a motor vehicle headlamp 10 having a reflection system with two reflection modules 16 , 18 is provided by the invention.
  • Each reflection module has a reflector and an associated LED light source. Both reflection modules contribute to both the generation of the dimmed lighting function as well as the generation of the high-beam lighting function. Both reflection modules have LED light sources with numerous LED chips. The LED chips of each of the two reflection modules are disposed in two groups, respectively.
  • Both light sources may each have a row of LED chips oriented longitudinally along a straight line as a group, that is transverse to the reflector axis, or to the main beam direction of the reflector, which is substantially aligned with the reflector axis. With the design according to FIG. 1 , these are the first group 22 and the third group 34 . This number of LED chips may be greater than or equal to four (If the performance of available LED chips improves drastically through future technological advances, at least 3.).
  • a further group of LED chips of a reflection module which has a lesser number of LED chips, has a (smaller) spacing to the group of LED chips having a greater number of LED chips in a reflection system in the main beam direction (direction of the reflector axis), wherein these further groups lie, in one case in front of, and in one case behind the first group in the main beam direction of the reflection module.
  • the further groups are the second group 26 and the fourth group 38 in the design according to FIG. 1 .
  • the first reflection module 16 With the first reflection module 16 , the further group having a lower number of chips (the second group 26 there), lies in front of the group that has a greater number of chips (the first group 22 there).
  • the further group having a lower number of chips (the fourth group 38 there) lies behind a group that has a greater number of chips (the third group 34 there).
  • the respective further group (in this case, groups 26 and 28 ) may also be oriented transverse to the axis.
  • the number of LED chips in the respective group 22 , 34 may be greater than the number of LED chips in the respective further group 26 , 38 .
  • the number of LED chips of the third group 34 may be greater than the number of LED chips in the fourth group 38 .
  • the number of LED chips in the first group may be equal to the number of LED chips in the third group 34 .
  • the number of LED chips in the second group 26 may be equal to the number of LED chips in the fourth group 38 .
  • FIG. 3 shows a partial light distribution generated by the reflection systems.
  • the reflection systems are configured as follows, with respect to the interaction of their reflectors and the associated groups of LED chips:
  • the first group 22 of LED chips of the first reflection system 16 generates, in interacting with the first reflector 20 , a partial light distribution TLV_ 22 , which, in particular in the horizontal direction, is comparatively less wide, and is not dimmed, e.g. as a contribution to a high-beam light distribution.
  • This partial light distribution TLV_ 22 has a comparatively strongly formed maximum, due to its limited width.
  • a non-dimmed partial light distribution TLV_ 38 generated by the second reflection system 18 with the fourth group 38 of LED chips serves here as a comparison standard, for example.
  • This further partial light distribution TLV_ 38 is a non-dimmed partial light distribution, which is wider, in comparison with the other non-dimmed partial light distribution TLV_ 22 , in particular in the horizontal direction H, and has a comparatively less bright maximum in its central region.
  • the central region lies around the intersection of the vertical axis V and the horizontal axis H.
  • the intersection lies fundamentally in the extension of the main beam direction in front of the vehicle in an intended use of the headlamp, wherein the z-axis is perpendicular to the plane defined by the axes V and H.
  • a dimmed partial light distribution TLV_ 34 as an additional, more widely diffused component of a high-beam light distribution when in the high-beam setting.
  • the third group 34 of LED chips of the second reflection module 18 generates, in contrast, a dimmed partial light distribution TLV_ 34 , having a comparatively greater expansion, in particular in the horizontal direction.
  • the comparison standard in this case is, in particular, the width of a dimmed light distribution TLV_ 26 generated by the first reflection module by activating the second group 26 of LED chips.
  • the second reflector 32 in conjunction with the arrangement of the third group 34 of LED chips, acts to generate a partial light distribution TLV_ 34 having an upper and at least partially, horizontally running light/dark border 52 , in the intended use of the headlamp.
  • the second reflector 32 is shaped such that its reflection images, thus the images of the light exit surfaces of the LED chips of the third group 34 of LED chips, which projects the reflector 32 in its foreground, does not extend beyond a specific line.
  • Each surface element of the reflector 32 projects such a reflection image, which can be projected, for example, onto a screen.
  • the position of the reflection image on the screen can be predetermined by the shape of the reflector. It also possible to determine thereby, that all or at least most of such reflection images, for example, lie on one side of a specific line on the screen, which results, with the sum of all of the reflection images, in the light distribution having the light/dark border.
  • the substantially horizontal light/dark border basically lies at the level of the horizon in front of the vehicle. This applies analogously to the first reflector 20 and the second group 26 .
  • the dimmed partial light distribution TLV_ 34 generated by the second reflection module is supplemented by activating the second group 26 of LED chips of the first reflection system 16 for the overall light distribution TLV_ 26 plus TLV_ 34 of the dimmed function, wherein the first reflection module 16 in this case generates a dimmed partial light distribution TLV_ 26 having weaker intensities and a basically straight, horizontal upper border 54 , which is comparatively less wide, in particular, in the horizontal direction.
  • the upper border is preferably designed as a sharply focused light/dark border. Because the two reflectors 20 , 32 are fundamentally identical, aside from slight differences in the horizontal diffusion widths and the LED assignments, as stated above, it is possible to fulfill the requirements pertaining to the signal images of both reflectors.
  • the light exit surfaces 30 , 42 of the two reflectors 20 , 32 have edge shapes and sizes that are similar to one another.
  • a similarity of the edge shapes is obtained, for example, when the edges of the light exit surfaces are circular or have the same number of corners, and similar edge lengths. Similar sizes are obtained when, if the light exit surfaces 30 , 42 are of different sizes, the circumference of the smaller light exit surface is not less than 80% of the circumference of the larger light exit surface.
  • FIG. 1 shows the horizontal adjacent reflectors of the first reflection module and the second reflection module, as they are depicted in an intended use when viewed from below.
  • the LED chips are enlarged in the depiction in relation to the rest of the components.
  • the z-axis points in the direction of travel.
  • the LED light sources are disposed on an upper side of the reflectors, such that the reflection surfaces of the reflectors extend downward from the position of the LED chips. This corresponds to the arrangement of the lower reflection module 16 in FIG. 4 .
  • FIG. 4 thus shows, in its lower half, a cross section of the subject matter of FIG. 1 , along the line IV-IV in FIG. 1 .
  • the light 55 emitted downward into the half space from the LED chips 28 of the second group 26 and the LED chips 24 of the first group 22 is collected by the concave mirror reflector 16 and projected into the foreground of the of the headlamp, bundled about a main beam direction z.
  • the headlamp is constructed such that the reflection surfaces extend upward, away from the LED chips. This is depicted in the upper half of FIG. 4 , which shows a section of a second reflection module 18 , which would lie parallel to the section IV-IV in FIG. 1 .
  • the reflectors including the LED light sources, can also be disposed vertically, above one another (preferably then with the LED chips facing one another) or diagonally offset to one another. This is depicted on the whole in FIG. 4 .
  • the LED chips of the second group 26 can be disposed such that they lie transverse in a line (such as those of the first group 22 ), but they can also be disposed such that they lie transverse and offset to one another (as indicated in FIG. 1 with the reflector 32 ). This positioning is preferably implemented for the fourth group 38 in the second reflection module 18 . With the second group 26 and the fourth group 38 , LED chips can also lie at a greater spacing to the z-axis, e.g. basically at the spacing that the outer LED chips of the first group 22 , or the third group 34 , respectively, has to the z-axis. The arrangement of the LED chips can also be asymmetrical, or at a diagonal to the z-axis.
  • these groups may be comprised of individual chips.
  • corresponding linear multiple chip light sources such as OSLON Black Flat 1 ⁇ 5 are used for the first group 22 and the third group 34 .
  • a special LED construction is also used for first group, because it must be possible to dispose the LED chips of the second group relatively close to the first group.
  • light sources with which both LED chip groups of a reflection module are disposed on an integrated substrate, and thus covered by the manufacturer of the light sources.
  • These integrated light sources can be specifically different or identical for each of the two reflection modules thereby. If they are identical, the same light sources can be used for both reflectors, but in different orientations.
  • the LEDs of the second group 26 and the fourth group 38 can also be disposed in the shape of diamond, thus with their edges not perpendicular and parallel to the x- and z-axes, but rotated approximately 45°. Other LED chip shapes are also conceivable. Individual chips can also be disposed such that they are rotated within a group.
  • the focal region is preferably basically in the center in the first group for the first reflection module 16 and is slightly behind the third group 34 , or close to the front edge, closer to the light exit surface 42 of the reflector 32 , of the light exit surfaces of the LED chips of the third group 34 , respectively.
  • these positions are aligned, in each case, with the respective intersection of the x-axis and the z-axis.
  • the position of the chip-row depicted in FIG. 1 must be mirror-reversed over the z-axis for both reflectors, such that, for example, for reflector 20 , the group 26 having three (or fewer) chips then lies closer to the exit surface 30 than the group 22 having five (or more) chips.
  • the second reflector with respect to the arrangement of the third group of LED chips, is shaped such that with activated LED chips of the third group, a comparatively sharply focused light/dark border is obtained.
  • the comparison standard here is the sharpness, thus the gradient of the brightness transverse to the light/dark border of the upper limit of the partial light distribution generated by the first reflection module when the LED chips of the second group 26 are activated.
  • This upper limit 54 also lies slightly below the sharply focused light/dark border 52 of the light/dark border generated by the second reflection module in a preferred design.
  • the second reflection module 18 In the case of the low-beam light function, only the second reflection module 18 generates the central, sharply focused light/dark border 52 having the diagonal rise in the bright region on one's own side of the roadway that is typical for the low-beam light distribution.
  • the control circuit 44 when the non-dimmed light function is generated, at least one or both dimmed partial light distributions are generated as well, such that they are superimposed on the non-dimmed partial light distributions, and result, in particular, in a reinforced illumination of the region lying beneath the horizon.
  • the control circuit 44 according to FIG. 1 represents, with its group-individual control paths, a group-individual control.
  • one group, or individual LED chips are assigned one or more attachment lenses, which are configured to collimate and orient the light from these LED chips, in order to redirect it to specific, appropriately shaped, reflector sub-regions, in order to more easily or better fulfill certain requirements, without compromising other reflector sub-regions.
  • attachment lenses configured to collimate and orient the light from these LED chips, in order to redirect it to specific, appropriately shaped, reflector sub-regions, in order to more easily or better fulfill certain requirements, without compromising other reflector sub-regions.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
US14/976,431 2014-12-22 2015-12-21 Motor vehicle headlamp having a two-chamber reflection system Active 2037-04-10 US10208910B2 (en)

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DE102014226881.8 2014-12-22
DE102014226881 2014-12-22
DE102014226881.8A DE102014226881A1 (de) 2014-12-22 2014-12-22 Kraftfahrzeugscheinwerfer mit einem Zweikammerreflexionssystem

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KR101975459B1 (ko) 2016-10-25 2019-05-08 에스엘 주식회사 차량용 램프
JP6910138B2 (ja) * 2016-12-14 2021-07-28 株式会社小糸製作所 車両用前照灯
CN106907649B (zh) * 2017-04-14 2023-04-07 广东泰耀汽车科技有限公司 Led汽车前照灯
JP6872413B2 (ja) * 2017-04-28 2021-05-19 株式会社小糸製作所 車両用灯具
WO2019069682A1 (ja) * 2017-10-06 2019-04-11 株式会社小糸製作所 車両用前照灯
JP7081261B2 (ja) * 2018-03-28 2022-06-07 市光工業株式会社 車両用灯具
JP7275976B2 (ja) * 2019-08-07 2023-05-18 市光工業株式会社 車両用灯具
FR3103255B1 (fr) * 2019-11-14 2021-12-31 Valeo Vision Dispositif lumineux d’un véhicule automobile à double éclairage, de type route et de type croisement
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US20160186952A1 (en) 2016-06-30
DE102014226881A1 (de) 2016-06-23
CN105716019B (zh) 2019-09-03
CN105716019A (zh) 2016-06-29

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